tree f21c59483ce1609f7daff9c4f9917054b7f0c200
parent 3514cbe554cf510042395a2de35ad3fead670a06
author honghaiz <honghaiz@webrtc.org> 1450319843 -0800
committer Commit bot <commit-bot@chromium.org> 1450319847 +0000

Add ufrag to the ICE candidate signaling.
On the receiving side, if a candidate arrives with an old ufrag, it will be dropped. If it contains a new frag that has never seen before, it will hold the ufrag and create connections, although those connections are not pingable until the ICE credentials are received.
This could avoid a bunch of ICE generation issues.

BUG=webrtc:5138,webrt:5292

Review URL: https://codereview.webrtc.org/1498993002

Cr-Commit-Position: refs/heads/master@{#11060}